Kossel-Lewis Approach to Chemical Bonding — Prelims Questions

Which of the following molecules violates the octet rule by having an expanded octet?

Calculate the formal charge on the sulfur atom in the sulfate ion, $SO_4^{2-}$, assuming a Lewis structure with two double bonds and two single bonds.

Which of the following compounds is an example of an incomplete octet?

According to the Kossel-Lewis approach, which of the following statements best describes the formation of an ionic bond?

Which of the following molecules has a central atom that does NOT obey the octet rule?

Which of the following is a limitation of the Kossel-Lewis approach to chemical bonding?